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Sender Policy Framework


There are several SPF libraries available. Many mail servers support SPF natively. Most popular mail servers also have extensions or unofficial patches available.

The SPF project does not endorse any of the software listed below unless noted otherwise. We have not checked all of the software for fitness for any purpose.

Please report SPF-supporting software to the spf-discuss mailing list or by contacting us directly.


NameTypeAuthor(s)ContactTest Suite releases passed
libspf2CShevek, Wayne Schlittspf-devel?
RMSPFC (Windows)Roger MoserRoger Moser?
Mail::SPFPerlJulian Mehnle, ShevekJulian Mehnle2008.08: since 2.006
2007.05: since 2.004
pyspfPythonStuart Gathman, Scott Kitterman, Terence Waysee Python Package IndexRFC 7208: since 2.0.9
2008.08: since 2.0.5
2007.05: since 2.0.4
jSPFJavaStefano Bagnara, Norman Maurersee website2007.05: since 0.9.6
InterPC.SPF.NETEddy MinetInterPC.SPF Forum2007.05: since 1.1

Mail Servers that natively support SPF

ArGoSoft Mail Server .NETArGo Software Design
Communigate ProStalker
Exim >=4.52Exim Project
Gordano Message SuiteGordano
Hexamail Server and related products  Hexamail
IMail Ver. 8.22 and higherIpswitch
Kerio MailServerKerio
MailEnableProfessional and Enterprise
MDaemonAlt-N Technologies
Merak Mail ServerIceWarp
qpsmtpdDevelooper LLC
RazorGate 6000Mirapoint
SPAM CrackerHorizon Network Security
WIN ServerSantronics Software

Extensions and Patches for Mail Servers

NameMail ServerAuthor(s)Contact
Courier::Filter SPF ModuleCourierJulian MehnleJulian Mehnle
Courier Python FilterCourierGordon MessmerGordon Messmer
exiscan ACLExim <4.52Tom KistnerTom Kistner
Exim patchExim 4.43nslmnslm
MEFilterMailEnableMartyn KeenMartyn Keen
postfix-policyd-spf-perlPostfixMeng, Kitterman, Mehnlespf-devel
pypolicyd-spfPostfixScott Kittermanspf-devel
tumgreyspfPostfixSean Reifschneider, tummy.comsee website
policyd-spf-fsPostfixMatthias CramerMatthias Cramer
Modular Python Postfix Policy ServerPostfixPetr Vokacsee website
Postfix Policy Server v2PostfixMichael Langsee website
ACL Policy DaemonPostfixThe Gna! Projectsee website
Whitelister OCAML Policy DaemonPostfixPierre HabouzitPierre Habouzit
Qmail PatchQmail 1.03Christophe SaoutChristophe Saout
libspf Qmail PatchQmailJames Couzens, Sean ComeauJames Couzens
libspf/libspf2 spfmilterSendmailJef PoskanzerJef Poskanzer
smf-spf MilterSendmailEugene KurmaninEugene Kurmanin
spf-milter (upstream, RPM, on site)SendmailMark KramerMark Kramer
Python MilterSendmailJim Niemira, Stuart D. Gathmansee website
milter-spiffSendmailAnthony Howesee website
Milter GreylistSendmailEmmanuel Dreyfus et al.see website
PTSMail Utilities (milter)SendmailPhoenix Technologies & Solutionsexperts@expertsinunix.com
Policy Patrol Spam FilterExchange,
Lotus Domino
Red Earth Softwaresee website
smf-spf (milter)SendmailEugene Kurmaninsee website
SPF Event SinkIIS SMTP Server,
Exchange 2000
Johan StrandJohan Strand
MailEssentialsAnti-Spam Filter Plugin for
IIS SMTP Server, Exchange
GFI Softwaresee website
Sunbelt Messaging NinjaExchange 2000/03Sunbelt Softwaresee website

Extensions for Mail Clients

Note that performing SPF checks in the mail client is problematic because it is often difficult to accurately obtain the required information from delivered messages.

NameMail ClientAuthor(s)Contact
Thunderbird Extension for Sender VerificationThunderbirdJoshua Tauberersee website

Other Software that supports SPF

Aloaha SPAM RejectorAnti-Spam SMTP ProxyAloaha Software
ASSPAnti-Spam SMTP ProxyThe ASSP project
Email Security ApplianceAnti-Spam FiltersCisco Systems
Clam Anti-virusAnti-virusClam Anti-virus
FakehermesFake secondary MX loggerHermes Project
CanItAnti-Spam Filter Plugin for SendmailRoaring Penguin Software
Netmail SecureNovell GroupWise spam protectionNetmail
LeonCorporate Anti-Spam ServerUniwares
Mail AvengerAnti-Spam SMTP ProxyDavid Mazières
Memova Anti-AbuseAnti-Abuse ApplianceCritical Path
ORF EEExchange & IIS SMTP spam filtervam|soft
PowerDNSDNS ServerPowerDNS
SpamAssassinAnti-Spam ScannerApache Software Foundation (ASF)
Spam Filter ISPAnti-Spam Filter ServerLogSat Software
Spug SpamProcmail C/R PluginMike Muller
Various productsE-mail Security SoftwareSymantec
XWallAnti-Spam SMTP ProxyDataEnter